A nurse is assisting with the care of an infant who requires emergency surgery and whose parent is an emancipated adolescent. Which of the following people can sign the informed consent form for the procedure?

A: By the age of 7, most children have a grasp of days and dates as part of their routine. However, not being able to verbalize the date does not necessarily indicate a developmental delay, as it could be related to the child's learning environment or educational opportunities.

B: Counting backwards is a skill that develops with age and practice. A 7-year-old may struggle with this task due to various reasons such as lack of practice, but it is not a definitive sign of a developmental delay.

C: Making change involves complex cognitive skills including math, understanding of money value, and transactions, which may still be developing in a 7-year-old. This skill varies widely among children and is influenced by their experiences with money.

D: The ability to distinguish right from left is a developmental milestone typically achieved by the age of 5 to 6 years. Persistent difficulty in telling the difference between right and left at the age of 7 could suggest a developmental delay in spatial awareness.

Rationale:

A) The diastolic value is recorded as the disappearance of Korotkoff sounds (K5), not the first sound (K1).

B) The cuff pressure should be released at a rate of 2-3 mm Hg/second, not 5 mm Hg/second.

C) Positioning the child's arm at the level of the heart ensures an accurate blood pressure measurement.

D) The cuff bladder size should be approximately 40% of the child's upper arm circumference, not 20%.